hadoop Service 源码
haddop Service 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/server/Service.java
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.lib.server;
import org.apache.hadoop.classification.InterfaceAudience;
/**
* Service interface for components to be managed by the {@link Server} class.
*/
@InterfaceAudience.Private
public interface Service {
/**
* Initializes the service. This method is called once, when the
* {@link Server} owning the service is being initialized.
*
* @param server the server initializing the service, give access to the
* server context.
*
* @throws ServiceException thrown if the service could not be initialized.
*/
public void init(Server server) throws ServiceException;
/**
* Post initializes the service. This method is called by the
* {@link Server} after all services of the server have been initialized.
*
* @throws ServiceException thrown if the service could not be
* post-initialized.
*/
public void postInit() throws ServiceException;
/**
* Destroy the services. This method is called once, when the
* {@link Server} owning the service is being destroyed.
*/
public void destroy();
/**
* Returns the service dependencies of this service. The service will be
* instantiated only if all the service dependencies are already initialized.
*
* @return the service dependencies.
*/
public Class[] getServiceDependencies();
/**
* Returns the interface implemented by this service. This interface is used
* the {@link Server} when the {@link Server#get(Class)} method is used to
* retrieve a service.
*
* @return the interface that identifies the service.
*/
public Class getInterface();
/**
* Notification callback when the server changes its status.
*
* @param oldStatus old server status.
* @param newStatus new server status.
*
* @throws ServiceException thrown if the service could not process the status change.
*/
public void serverStatusChange(Server.Status oldStatus, Server.Status newStatus) throws ServiceException;
}
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